I've got the Elite 431+ case and Seidon 120 and some things do not make sense to me. The Seidon radiator does not fit in the space for the fan, so instead of air is drawn in by the fan through the radiator it is blown, an increase of noise and loss of efficiency.
Installing Seidon blocked one of the fans on top of the case. For me it is important to cool the case, I have four hard drives inside.
The power supply prevents the placement of the lower fan. In short: the case offers three options for installing fans but I can only use ONE (?!).
Nevertheless, I would like to congratulate you for the excellent product quality, want to buy other.
Thanks in advance.
BTW: English is not my native language, of course.